/**
 * 页面上的操作按钮类
 */
 class WebBtn {
     public  upButton:HTMLElement
     public leftButton:HTMLElement
     public rightButton:HTMLElement
     public downButton:HTMLElement
     constructor() {
         this.upButton = document.getElementById("upButton");
         this.leftButton = document.getElementById("leftButton");
         this.rightButton = document.getElementById("rightButton");
         this.downButton = document.getElementById("downButton");
     }
 }


 export default WebBtn
